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Always have math functions but with
weak
linking attribute if we can
This is a replacement for rust-lang/libm#290 This fixes crashes during compilations for targets that don't have math symbols by default. So, we will provide them libm symbols, but mark it as `weak` (if its supported), so that the linker will choose the system builtin functions, since those are sometimes more optimized. If the linker couldn't find those, it will go with `libm` implementation.
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